240839381 has 2 divisors, whose sum is σ = 240839382. Its totient is φ = 240839380.

The previous prime is 240839359. The next prime is 240839419. The reversal of 240839381 is 183938042.

It is an a-pointer prime, because the next prime (240839419) can be obtained adding 240839381 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 221116900 + 19722481 = 14870^2 + 4441^2 .

It is a cyclic number.

It is not a de Polignac number, because 240839381 - 2⁶ = 240839317 is a prime.

It is a super-2 number, since 2×240839381² = 116007214880926322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (240839311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120419690 + 120419691.

It is an arithmetic number, because the mean of its divisors is an integer number (120419691).

Almost surely, 2^240839381 is an apocalyptic number.

It is an amenable number.

240839381 is a deficient number, since it is larger than the sum of its proper divisors (1).

240839381 is an equidigital number, since it uses as much as digits as its factorization.

240839381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 240839381 is about 15519.0006443714. Note that the first 3 decimals coincide. The cubic root of 240839381 is about 622.1701448632.

The spelling of 240839381 in words is "two hundred forty million, eight hundred thirty-nine thousand, three hundred eighty-one".